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???
07/05/06 12:50
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 		 #119662 - Hysteresis
Responding to: ???'s previous message
David said:
The former is 20-bit, the latter 24-bit. Used with bridge sensors (load cells in my case), they require no additional components on the input that could significantly influence error,...

Yes, that's the key! Avoid additional analog components as much as you can, at least the avoidable ones affecting the offset and gain setting, and profit from sophisticated drift cancelling schemes on die!


David said:
One effect I have noticed with these converters is a cyclical, almost random, low frequency (typically 0.1Hz) span noise.

Are you sure that it's not from the load cell? Have experienced annoying hysteresis effects with load cells once. Hysteresis here means, that after adding and removing same extra weight reading shows a difference. Often a slowly creeping to the original reading could be observed afterwards, but not always reaching the original reading.

Kai

List of 32 messages in thread
TopicAuthorDate
Guide line requried for 24 bit adc            01/01/70 00:00      
   essential            01/01/70 00:00      
   And of course ...            01/01/70 00:00      
   high precision!!            01/01/70 00:00      
      Why ?            01/01/70 00:00      
         Averaging ...            01/01/70 00:00      
            Random drift            01/01/70 00:00      
               True, but ...            01/01/70 00:00      
                  24bit accuracy can never be achieved            01/01/70 00:00      
                     Cirrus Logic ADCs            01/01/70 00:00      
                        Cirrus Logic ADCs part no ?            01/01/70 00:00      
                        Hysteresis            01/01/70 00:00      
                           Cirrus Logic.            01/01/70 00:00      
                              Mains beat            01/01/70 00:00      
                                 OT: mains beat on ancient TVs            01/01/70 00:00      
                                    TV sync            01/01/70 00:00      
         the point is            01/01/70 00:00      
            apart from getting it to work            01/01/70 00:00      
               For instance...            01/01/70 00:00      
      What it says in the datasheet            01/01/70 00:00      
         That's the Key!            01/01/70 00:00      
            And how will you verify...            01/01/70 00:00      
   adc            01/01/70 00:00      
      Example            01/01/70 00:00      
         And..            01/01/70 00:00      
      Availability != General Requirement            01/01/70 00:00      
         Cirrus Logic ADCs part no ?            01/01/70 00:00      
            i got curious            01/01/70 00:00      
   Have a look at this            01/01/70 00:00      
      marketing lingo            01/01/70 00:00      
         From the datasheet:            01/01/70 00:00      
            When is good enough            01/01/70 00:00      

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